Violet anthraquinone dye.



' anthraquinones.

NITED STATES PATENT ()FFI E.

OSCAR BALLY, or MANNHEIM, GERMANY, Asslenon TO THE BADISOHE ANILINVVAND SODA FABRIK, or LUDWIGSHAFEN, GERMANY.

VIOLET ANTHRAQUIIINONE DYE.

SPECIFICATION forming part of Letters Patent No. 648,332, dated April 24, 1900.

' Application filed January 24, 1900. Serial No. 2,642. (No specimens.) i

' To all whom it may concern:

vented new and useful Improvementsin G01 oring-Matters of the Anthraquinone Series, of which the following is a specification.

In the specifications of Letters Patent N 0s. 631,607 and 631,608 I described the production of brominated derivatives of diamido- Mypresent invention .relates to the manufacture of violet to blueviolet coloring-matters by treatment of the.

said brominated derivatives with boracicracid and sulfuric-acid solution and subsequently sulfonating. The following example Will serve to further illustrate my inventionand themanner in which it is carried into practical effect and my new coloring-matter obtained. Theparts are by weight.

Example: Prepare a mixture of one hun-' dred (100) parts of the brom'in derivative of 1.5-diamido-anthraquinone (such as can beobtained by treating diamido-anthraquinone in glacial acetic acid with an excess of bromin) and one hundred (100) parts of boracic acid. Add this mixture at the ordinary temperature and while stirring to about two thousand (2,000) parts of concentrated sulfurie acid, (containing about ninety-six per cent. H 80 A solution is gradually obtained, and the whole mass assumes a violet color. Then heat the melt at a temperature of 100 oentigrade until the colorhas become pure blue. Next add about two thousand (2,000) parts of fuming sulfuric acid, (containing forty per cent. free anhydride,) and,

treatment with bichromate of potash. Upon chrome-mordanted Wool the coloring-matter gives violet-blue shades. The solution in hot water is violet blue, in caustic soda it is blue,

in alcohol blue violet, in anilin pure blue,

and in concentrated sulfuric acid'yellow.

. Now what I claim isi The herein-describednew-article of manufacturethe new coloring-matter which can'be obtained by treatment of halogen derivatives of diamido-anthraquinone with boracic acid and sulfuric acid, and subsequentlysulfonat- -ing and which contains halogen and is readily soluble in hot water, soluble in caustic soda, alcohol, and anilin, and which yields a yellow solution in concentrated sulfuric acid.

In testimony whereof I have hereunto set my hand in .the presence of two subscribing witnesses.

I OSCAR BALLY.

Witnesses:

ERNEST F. EHRHARDT, PERCY J. J ONES. 

